Load Specifications
Bullet Manufacturer:Reichenberg
Bullet Weight:139 gr
Bullet Diameter:0.284"
Bullet Length:<<locked>>
Caliber:.280 Ackley Improved load data
Case Length (l3):2.54"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:74 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:65,000 psi
Recommended Twist Rate:1:11.0
Load data in caliber .280 Ackley Improved with .284 | 139gr | Reichenberg HDB Universal bullet and 104 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-16 and Hodgdon Superformance.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 82% | 58,697 psi | 90% | 2871 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 58,581 psi | 90% | 2904 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,666 psi | 87% | 2920 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,647 psi | 76% | 2887 fps | 98.5% |
| Accurate 4064 | <<locked>> | 88% | 58,755 psi | 90% | 2959 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,680 psi | 86% | 3009 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 84% | 58,189 psi | 90% | 2992 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,637 psi | 86% | 2940 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 57,000 psi | 88% | 3048 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,681 psi | 87% | 2933 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 58,624 psi | 90% | 2904 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 58,508 psi | 90% | 3123 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 56,173 psi | 86% | 2966 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,666 psi | 87% | 2989 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 56,376 psi | 87% | 3068 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 58,117 psi | 89% | 3100 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,927 psi | 86% | 3031 fps | 97.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,545 psi | 76% | 2969 fps | 96.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,731 psi | 72% | 2913 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,901 psi | 63% | 2815 fps | 97.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 53,563 psi | 82% | 3107 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 58,189 psi | 90% | 3009 fps | 100% |
| Bofors RP3 | <<locked>> | 88% | 57,159 psi | 88% | 2982 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,545 psi | 76% | 2969 fps | 96.3% |
| Bofors RP7 | <<locked>> | 92% | 56,536 psi | 87% | 2956 fps | 98.3% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,899 psi | 89% | 2910 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,695 psi | 87% | 2966 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 57,740 psi | 89% | 2999 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 94% | 58,088 psi | 89% | 3061 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 92% | 58,088 psi | 89% | 3022 fps | 98.1% |
| Hodgdon H4895 | <<locked>> | 82% | 55,114 psi | 85% | 2946 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 56,666 psi | 87% | 2986 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,317 psi | 85% | 2986 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 58,726 psi | 90% | 3104 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,114 psi | 56% | 1837 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,231 psi | 87% | 2949 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,608 psi | 86% | 2927 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 58,581 psi | 90% | 2976 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 58,088 psi | 89% | 2959 fps | 98.9% |
| IMR 4350 | <<locked>> | 96% | 57,334 psi | 88% | 2989 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 92% | 58,349 psi | 90% | 2989 fps | 98.9% |
| IMR 4831 | <<locked>> | 96% | 56,202 psi | 86% | 2999 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 58,102 psi | 89% | 3015 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 56,681 psi | 87% | 2933 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 58,479 psi | 90% | 2963 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,826 psi | 87% | 2910 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 58,668 psi | 90% | 2969 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 58,320 psi | 90% | 2986 fps | 99.6% |
| Lovex S070 | <<locked>> | 94% | 55,985 psi | 86% | 2969 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,321 psi | 64% | 2733 fps | 96.7% |
| Norma 201 | <<locked>> | 84% | 56,695 psi | 87% | 2933 fps | 100% |
| Norma 202 | <<locked>> | 84% | 57,421 psi | 88% | 2930 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,898 psi | 86% | 2972 fps | 100% |
| Norma 204 | <<locked>> | 96% | 58,436 psi | 90% | 3045 fps | 97.7% |
| Norma MRPᴾ | <<locked>> | 100% | 52,533 psi | 81% | 3054 fps | 98.3% |
| Norma URP | <<locked>> | 96% | 58,059 psi | 89% | 3048 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 56,579 psi | 87% | 2999 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 56,956 psi | 88% | 3048 fps | 99.4% |
| Ramshot TAC | <<locked>> | 82% | 56,971 psi | 88% | 2963 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 82% | 57,014 psi | 88% | 2976 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,724 psi | 56% | 1880 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 57,711 psi | 89% | 2979 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 57,479 psi | 88% | 3058 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 57,638 psi | 89% | 3094 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,535 psi | 85% | 3031 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 58,160 psi | 89% | 3120 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 57,551 psi | 89% | 2910 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 57,435 psi | 88% | 2933 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 57,290 psi | 88% | 2979 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 54,998 psi | 85% | 2959 fps | 96% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 55,303 psi | 85% | 3022 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 92% | 56,536 psi | 87% | 2956 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 94% | 58,320 psi | 90% | 2986 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 84% | 58,479 psi | 90% | 2963 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 58,668 psi | 90% | 2969 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,985 psi | 86% | 2969 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,187 psi | 85% | 2982 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,709 psi | 86% | 2940 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,405 psi | 87% | 2959 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,624 psi | 89% | 2861 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 58,378 psi | 90% | 2861 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 58,233 psi | 90% | 2936 fps | 99% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,795 psi | 84% | 3015 fps | 97.4% |
| Somchem S335 | <<locked>> | 84% | 57,261 psi | 88% | 2858 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,492 psi | 85% | 2930 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 57,000 psi | 88% | 2969 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 57,145 psi | 88% | 3051 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,869 psi | 86% | 2992 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 84% | 58,059 psi | 89% | 2841 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 57,551 psi | 89% | 2890 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 58,001 psi | 89% | 2907 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 58,682 psi | 90% | 2946 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,710 psi | 87% | 2989 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,124 psi | 74% | 2848 fps | 96.4% |
| Vihtavuori N530 | <<locked>> | 82% | 57,363 psi | 88% | 2936 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 56,072 psi | 86% | 2900 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,898 psi | 86% | 2995 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,141 psi | 80% | 2992 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 56,550 psi | 87% | 2959 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,928 psi | 89% | 2986 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 58,349 psi | 90% | 3064 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,989 psi | 65% | 2949 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,739 psi | 87% | 2969 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,344 psi | 81% | 2927 fps | 96.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 55,143 psi | 85% | 2825 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 48,269 psi | 74% | 2759 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,456 psi | 71% | 2746 fps | 96.2% |
| Accurate 3100 | <<locked>> | 92% | 37,811 psi | 58% | 2657 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 45,716 psi | 70% | 2759 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,403 psi | 53% | 2598 fps | 96.3% |
| ADI AR 2206H | <<locked>> | 80% | 51,256 psi | 79% | 2884 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,439 psi | 67% | 2726 fps | 99% |
| ADI AR 2209 | <<locked>> | 94% | 46,789 psi | 72% | 2864 fps | 95.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,316 psi | 82% | 2884 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 54,897 psi | 84% | 2858 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,485 psi | 73% | 2936 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,801 psi | 67% | 2756 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,818 psi | 72% | 2822 fps | 99.6% |
| Alliant Reloder-16 | 48.1 gr | 80% | 33,968 psi | 52% | 2608 fps | 96.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,232 psi | 59% | 2740 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 94% | 46,137 psi | 71% | 2854 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 46,253 psi | 71% | 2904 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,079 psi | 43% | 2461 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 96% | 35,969 psi | 55% | 2694 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 88% | 34,592 psi | 53% | 2703 fps | 95.8% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,763 psi | 78% | 2890 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 43,816 psi | 67% | 2759 fps | 99.8% |
| Bofors RP5 | <<locked>> | 98% | 46,253 psi | 71% | 2904 fps | 95.4% |
| Bofors RP7 | <<locked>> | 82% | 41,495 psi | 64% | 2680 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 54,505 psi | 84% | 2861 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,997 psi | 82% | 2910 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,469 psi | 68% | 2769 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 84% | 41,713 psi | 64% | 2766 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 84% | 44,962 psi | 69% | 2789 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 51,793 psi | 80% | 2894 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,473 psi | 48% | 2503 fps | 97.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,283 psi | 74% | 2871 fps | 100% |
| Hodgdon Superformance | 57.5 gr | 84% | 40,973 psi | 63% | 2776 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,876 psi | 41% | 1640 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,472 psi | 76% | 2841 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,083 psi | 80% | 2877 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,643 psi | 70% | 2762 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,138 psi | 74% | 2789 fps | 97.3% |
| IMR 4350 | <<locked>> | 86% | 41,945 psi | 65% | 2710 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,350 psi | 62% | 2657 fps | 95.1% |
| IMR 4831 | <<locked>> | 80% | 33,315 psi | 51% | 2556 fps | 96% |
| IMR 4895 | <<locked>> | 80% | 47,993 psi | 74% | 2854 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 80% | 53,316 psi | 82% | 2884 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 51,271 psi | 79% | 2858 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,328 psi | 77% | 2808 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 45,788 psi | 70% | 2762 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,826 psi | 58% | 2605 fps | 96% |
| Lovex S070 | <<locked>> | 84% | 40,973 psi | 63% | 2694 fps | 95.8% |
| Lovex S071 | <<locked>> | 96% | 36,143 psi | 56% | 2621 fps | 95% |
| Norma 201 | <<locked>> | 80% | 50,053 psi | 77% | 2828 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,705 psi | 78% | 2828 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,195 psi | 71% | 2808 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 47,732 psi | 73% | 2864 fps | 95.4% |
| Norma MRP | <<locked>> | 94% | 42,569 psi | 65% | 2861 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 34,345 psi | 53% | 2592 fps | 96.1% |
| Ramshot Big Game | <<locked>> | 80% | 46,224 psi | 71% | 2828 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 38,072 psi | 59% | 2694 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 53,171 psi | 82% | 2900 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,388 psi | 82% | 2923 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,485 psi | 42% | 1683 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,556 psi | 69% | 2749 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,256 psi | 77% | 2940 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,625 psi | 63% | 2802 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,968 psi | 52% | 2608 fps | 95.7% |
| ReloadSwiss RS 70 | 53.9 gr | 82% | 35,868 psi | 55% | 2674 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 54,157 psi | 83% | 2861 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,703 psi | 73% | 2779 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,147 psi | 63% | 2703 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 51,663 psi | 79% | 2900 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 94% | 45,179 psi | 70% | 2838 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 82% | 41,495 psi | 64% | 2680 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,826 psi | 58% | 2605 fps | 96% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,271 psi | 79% | 2858 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,788 psi | 70% | 2762 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 40,973 psi | 63% | 2694 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,337 psi | 65% | 2759 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,112 psi | 80% | 2881 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,676 psi | 76% | 2851 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,039 psi | 79% | 2766 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,946 psi | 66% | 2628 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,494 psi | 61% | 2602 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 44,744 psi | 69% | 2835 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 50,763 psi | 78% | 2766 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,648 psi | 79% | 2871 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,713 psi | 64% | 2707 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 30,922 psi | 48% | 2549 fps | 98.3% |
| Somchem S385 | <<locked>> | 92% | 42,975 psi | 66% | 2762 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 51,517 psi | 79% | 2753 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,718 psi | 73% | 2749 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,921 psi | 74% | 2759 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,726 psi | 61% | 2635 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 35,824 psi | 55% | 2598 fps | 96.6% |
| Vihtavuori N165 | <<locked>> | 98% | 45,078 psi | 69% | 2792 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 53,577 psi | 82% | 2881 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,499 psi | 72% | 2753 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,404 psi | 54% | 2598 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 84% | 30,661 psi | 47% | 2539 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,114 psi | 54% | 2569 fps | 98.5% |
| Winchester 748 | <<locked>> | 80% | 54,157 psi | 83% | 2930 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 41,930 psi | 65% | 2769 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 88% | 28,268 psi | 43% | 2549 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,647 psi | 76% | 2861 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 48,979 psi | 75% | 2867 fps | 95.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 104 powders for .280 Ackley Improved loaded with the .284 | 139gr | Reichenberg HDB Universal. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,123 fps; across all powders the maximum-charge window runs from 1,837 fps to 3,123 fps. Accurate 3100 gives the best case fill at 100 %, and 104 of the 104 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (448 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. ReloadSwiss RS 70, Alliant Reloder-16, Hodgdon Superformance rank at the top here: for .280 Ackley Improved with the .284 | 139gr | Reichenberg HDB Universal they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.